don't use "this == NULL"

pkgsrc-icewm.diff

--- icewm-1.2.38pre2/src/wmapp.cc.orig	2018-11-17 21:38:20.514477855 +0900
+++ icewm-1.2.38pre2/src/wmapp.cc	2018-11-17 21:18:08.144145670 +0900
@@ -608,14 +608,21 @@
 
         for (int a = 0; a <= 1; a++) {
             for (int b = 0; b <= 1; b++) {
-                frameT[a][b]->replicate(true, copyMask);
-                frameB[a][b]->replicate(true, copyMask);
-                frameL[a][b]->replicate(false, copyMask);
-                frameR[a][b]->replicate(false, copyMask);
+                if (frameT[a][b] != null)
+                    frameT[a][b]->replicate(true, copyMask);
+                if (frameB[a][b] != null)
+                    frameB[a][b]->replicate(true, copyMask);
+                if (frameL[a][b] != null)
+                    frameL[a][b]->replicate(false, copyMask);
+                if (frameR[a][b] != null)
+                    frameR[a][b]->replicate(false, copyMask);
             }
-            titleS[a]->replicate(true, copyMask);
-            titleT[a]->replicate(true, copyMask);
-            titleB[a]->replicate(true, copyMask);
+            if (titleS[a] != null)
+                titleS[a]->replicate(true, copyMask);
+            if (titleT[a] != null)
+                titleT[a]->replicate(true, copyMask);
+            if (titleB[a] != null)
+                titleB[a]->replicate(true, copyMask);
         }
 
         menuButton[0] = paths.loadPixmap(0, "menuButtonI.xpm");
--- icewm-1.2.38pre2/src/yimage.cc.orig	2009-11-09 03:59:46.000000000 +0900
+++ icewm-1.2.38pre2/src/yimage.cc	2018-11-17 21:41:50.574372282 +0900
@@ -244,7 +244,7 @@
 }
 
 void YPixmap::replicate(bool horiz, bool copyMask) {
-    if (this == NULL || pixmap() == None || (fMask == None && copyMask))
+    if (pixmap() == None || (fMask == None && copyMask))
         return;
 
     int dim(horiz ? width() : height());